Add unit tests for Configuration#config_files
Add unit tests for Configuration#config_files

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FlyingWHR/jekyll,stomar/jekyll,superve/jekyll,bsmr-ruby/jekyll,hartmel/jekyll,jmptrader/jekyll,adilapapaya/jekyll,alfredxing/jekyll,SQS2/Test,teju111/jekyll,EddieDow/jekyll,alihalabyah/jekyll,chiyodad/jekyll,CPVPLachlan/CPVP-Blog,marrujoalex/jekyll,chinayin/jekyll,brint/jekyll,richsoni/jekyll,x-way/jekyll,jekyll/jekyll,foocoder/jekyll,mrb/jekyll,Wirachmat/jekyll,ewinkler/jekyll